Diagonal Jumping up Blocks favors X-Axis

Jumping up from the corner of a block clearly favors the x-axis; that is even with a forward or backward input you will move more in the positive or negative x-direction rather than equally in the x and z directions as it was in previous versions.

Reproduction Steps:

1. Dig a block out with even terrain around it
2. Move forward into a corner
3. Jump while keeping the key pressed

If you reproduce this you should find that your jump clearly favors the x-axis, you move about a block in that direction, but barely move along the z-axis.